GloFish are a patented product and breeding is restricted by law.GloFish are genetically engineered zebra danios. Breed them willnot produce GloFish that are true to color. Th…ey will look likeregular zebra danios. They are egg layers. If you have males andfemales together you will get fry.

The usual reason is not being looked after properly. They are tropical fish and need a temperature of about 75F plus one fish needs to be kept in at least 2 gallons of water a…nd should have a filter running 24/7 and a 50% water change every week. The basic rule is "1 inch of fish needs at least 1 gallon of water".

Where does the fluorescent color come from? The fluorescent color in our fish is produced by a fluorescent protein gene, which creates the beautiful fluorescence that can be… seen when looking at the fish. The fluorescent protein genes occur naturally, and are derived from marine organisms. Exactly how is the fluorescent protein gene added to the fish? Every line of GloFishÂ® fluorescent fish (i.e., GloFishÂ® Starfire RedÂ® Zebra, GloFishÂ® Electric GreenÂ® Zebra, and GloFishÂ® Sunburst OrangeÂ® Zebra) starts with a single fish. The process begins by adding a fluorescence gene to the fish before it hatches from its egg. Once the gene integrates into the genome (i.e., genetic code) of the embryo, the developing fish will be able to pass the fluorescence gene along to its offspring upon maturity. Because of this, the gene only needs to be added to one embryo; from that point forward, all subsequent fluorescent fish are the result of traditional breeding.